Section 3.1 Volcanoes and Plate Tectonics

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Vocabulary

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Volcano: a weak spot in the crust where molten material, comes up to the surface

Magma: a mixture of gases and water from the mantle

Lava: when magma reaches to the surface, it becomes lava

Ring of Fire: a major volcanic belt, formed by many volcanoes along the Pacific Ocean

Hot Spot: an area where magma from inside the mantle melts through the crust

Outline

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What is a Volcano

• volcano
  • magma
  • lava

Location of Volcanoes

• ring of fire

Volcanoes at Diverging Plate Boundaries

• mid-ocean ridge

Volcanoes at Converging Boundaries

• island arc
• subduction

Hot Spot Volcanoes

• hot spots
• no subduction
• could form a volcanic mountains
• form under continents